Improved elevated temperature performance of commercial LiMn2O4 coated with LiNi0.5Mn1.5O4

Qiu, Tian; Wang, Juan; Lu, Yanluo; Yang, Wensheng

doi:10.1016/j.electacta.2014.08.122

Cited by 34 publications

(15 citation statements)

References 31 publications

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“…The voltage difference between the charge and discharge plateaus for the modified LiMn2O4 samples maintains the same as the cycle number increases from the first cycle to the 200th cycle, whereas the value for the bare LiMn2O4 sample increases slightly. These facts demonstrate a suppressed polarization increment and inner resistance of the batteries to the modified LiMn2O4 samples [38,39]. The surface-modified samples experience less loss of the initial capacity, and better cycling performance.…”

Section: Resultsmentioning

confidence: 75%

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Han

Chen

Saito

et al. 2016

Electrochimica Acta

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The surface of spinel LiMn2O4 is modified with different quantities of a Mn 4+ -rich phase prepared by a facile sol-gel method to improve electrochemical properties at elevated temperatures. Impurityfree and uniform morphologies for the LiMn2O4 particles are demonstrated from the X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The Mn 4+ -rich phase modified on the surface of the LiMn2O4 alleviates the dissolution of manganese in the electrolyte, thus improving the cycling performance and rate capability relative to the bare LiMn2O4. 1 wt.%modified LiMn2O4 delivers a capacity retention of 92.7% and a discharge capacity of 113.5 mAhg -1 after 200 cycles at 1 C and 25 °C, compared with that of 83.1%, and 100.8 mAhg -1 for the bare LiMn2O4. In addition, after 100 cycles, a capacity retention of 88.6% at 1 C is achieved for 1 wt.%modified LiMn2O4 at 55 °C, which is higher than the 76.0% for the bare LiMn2O4. Furthermore, this sample shows the best rate capability among all samples. The Mn 4+ -rich phase is an appropriate candidate for modifying surfaces to suppress dissolution of manganese, thereby improving the electrochemical properties of LiMn2O4.

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Section: Resultsmentioning

confidence: 75%

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Han

Chen

Saito

et al. 2016

Electrochimica Acta

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“…Various methods have been developed to increase the performances of cathode materials, among which surface coating is the most effective method . Various coating materials have been used, including non‐electrochemically active elements, active electrode materials, phosphate, and carbon . Al, Ti, Zr, and Zn are commonly used non‐electrochemical active elements for cathode coating.…”

Section: Introductionmentioning

confidence: 99%

Improvement in electronic conductivity of perovskite electrolyte by variable‐valence element doping

et al. 2020

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The perovskite electrolyte Li0.33La0.557TiO3 (LLTO) exhibits high mechanical stability, high ionic conductivity, and low strain during cycling. The cycle stability has been significantly improved using LLTO as a coating material for cathode particles. However, the electronic conductivity of LLTO is very low, which affects electrochemical performances. In this study, variable‐valence elements (Fe, Ni, Co, and Cr) are added to the perovskite to increase the electronic conductivity. The materials are fabricated using a high‐temperature solid‐state reaction method. The phase compositions are characterized by X‐ray diffraction (XRD), while the microstructures are analyzed by scanning electron microscopy. The electronic conductivity of the doped sample is increased by three orders of magnitude, while the ionic conductivity is slightly reduced. The Cr‐doped sample exhibits the highest electronic conductivity of 9.18 × 10−7 S cm−1. The search for mixed conducting perovskites paves the way for the development of efficient coatings for cathode particles.

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“…149 The high voltage cathode material LiNi 0.5 Mn 1.5 O 4 was used to modify the surfaces of Li 2 Mn 2 O 4 cores, and good electrochemical performance was achieved. [150][151][152][153] Li 2 TiO 3 , Li 0.17 La 0.61 -TiO 3 , Li 2 ZrO 3 , LiNbO 3 , and LiBO, etc. were researched with the aim of suppressing Mn dissolution and promoting good cell performance (Fig.…”

Section: Metal Oxide Coatingmentioning

confidence: 99%

Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes

Mao

Guo

2015

RSC Adv.

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Spinel LiMn2O4 (LMO)-based composites, due to their combination of low toxicity, abundant natural resources, and excellent electrochemical performance, are regarded as promising candidate cathode materials for lithium ion batteries. Current energy storage demands are not being met with existing materials, however, because of their defects, such as fast capacity fading, low rate capability, and low specific capacity in practical applications. Manganese dissolution during electrochemical processes bears the major responsibility for capacity loss, apart from the electrolyte factor. Low electrical conductivity, low ionic diffusion efficiency, and large structural variation have adverse effects on the electrochemical performance of materials. With respect to these drawbacks, significant progress has been made recently on optimizing the performance of LMO-based cathode materials. In this work, we review recent progress in 1 structural design, designing composites with graphene/carbon nanotubes, crystalline doping, and coatings for improving the electrochemical performance of these cathode materials. Spinel LiMn 2 O 4 (LMO)-based composites, due to their combination of low toxicity, abundant natural resources, and excellent electrochemical performance, are regarded as promising candidate cathode materials for lithium ion batteries. Current energy storage demands are not being met with existing materials, however, because of their defects, such as fast capacity fading, low rate capability, and low specific capacity in practical applications. Manganese dissolution during electrochemical processes bears the major responsibility for capacity loss, apart from the electrolyte factor. Low electrical conductivity, low ionic diffusion efficiency, and large structural variation have adverse effects on the electrochemical performance of materials. With respect to these drawbacks, significant progress has been made recently on optimizing the performance of LMO-based cathode materials. In this work, we review recent progress in 1 structural design, designing composites with graphene/carbon nanotubes, crystalline doping, and coatings for improving the electrochemical performance of these cathode materials.

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Improved elevated temperature performance of commercial LiMn2O4 coated with LiNi0.5Mn1.5O4

Cited by 34 publications

References 31 publications

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Improvement in electronic conductivity of perovskite electrolyte by variable‐valence element doping

Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes

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Improved elevated temperature performance of commercial LiMn2O4 coated with LiNi0.5Mn1.5O4

Cited by 34 publications

References 31 publications

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Improved electrochemical performance of LiMn2O4 surface-modified by a Mn4+-rich phase for rechargeable lithium-ion batteries

Improvement in electronic conductivity of perovskite electrolyte by variable‐valence element doping

Research progress on design strategies, synthesis and performance of LiMn2O4-based cathodes

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Research progress on design strategies, synthesis and performance of LiMn₂O₄-based cathodes